2022-12-04 10:46:24 +00:00
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#lang racket/base
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(require racket/dict
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racket/function
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racket/match
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racket/string
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"pure-utils.rkt"
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"url-utils.rkt"
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"xexpr-utils.rkt")
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(provide
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2023-02-05 04:56:15 +00:00
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preprocess-html-wiki
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2022-12-04 10:46:24 +00:00
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update-tree-wiki)
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2023-02-05 04:56:15 +00:00
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(define (preprocess-html-wiki html)
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(define ((rr* find replace) contents)
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(regexp-replace* find contents replace))
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((compose1
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; fix navbox list nesting
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; navbox on right of page has incorrect html "<td ...><li>" and the xexpr parser puts the <li> much further up the tree
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; add a <ul> to make the parser happy
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; usage: /fallout/wiki/Fallout:_New_Vegas_achievements_and_trophies
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(rr* #rx"(<td[^>]*>\n?)(<li>)" "\\1<ul>\\2")
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; change <figcaption><p> to <figcaption><span> to make the parser happy
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(rr* #rx"(<figcaption[^>]*>)[ \t]*<p class=\"caption\">([^<]*)</p>" "\\1<span class=\"caption\">\\2</span>"))
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html))
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(module+ test
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(check-equal? (preprocess-html-wiki "<td class=\"va-navbox-column\" style=\"width: 33%\">\n<li>Hey</li>")
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"<td class=\"va-navbox-column\" style=\"width: 33%\">\n<ul><li>Hey</li>")
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(check-equal? (preprocess-html-wiki "<figure class=\"thumb tright\" style=\"width: 150px\"><a class=\"image\"><img></a><noscript><a><img></a></noscript><figcaption class=\"thumbcaption\"> <p class=\"caption\">Caption text.</p></figcaption></figure>")
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"<figure class=\"thumb tright\" style=\"width: 150px\"><a class=\"image\"><img></a><noscript><a><img></a></noscript><figcaption class=\"thumbcaption\"><span class=\"caption\">Caption text.</span></figcaption></figure>"))
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2022-12-04 10:46:24 +00:00
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(module+ test
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(require rackunit
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"html-parsing/main.rkt")
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(define wiki-document
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'(*TOP*
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(div (@ (class "mw-parser-output"))
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(aside (@ (role "region") (class "portable-infobox pi-theme-wikia pi-layout-default"))
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(h2 (@ (class "pi-item pi-title") (data-source "title"))
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"Infobox Title")
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(figure (@ (class "pi-item pi-image") (data-source "image"))
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(a (@ (href "https://static.wikia.nocookie.net/nice-image.png") (class "image image-thumbnail") (title ""))
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(img (@ (src "https://static.wikia.nocookie.net/nice-image-thumbnail.png") (class "pi-image-thumbnail")))))
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(div (@ (class "pi-item pi-data") (data-source "description"))
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(h3 (@ (class "pi-data-label"))
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"Description")
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(div (@ (class "pi-data-value"))
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"Mystery infobox!")))
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(div (@ (data-test-collapsesection) (class "collapsible collapsetoggle-inline collapsed"))
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(i (b "This section is hidden for dramatic effect."))
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(div (@ (class "collapsible-content"))
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(p "Another page link: "
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(a (@ (data-test-wikilink) (href "https://test.fandom.com/wiki/Another_Page") (title "Another Page"))
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"Another Page"))))
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(figure (@ (class "thumb tnone"))
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(a (@ (href "https://static.wikia.nocookie.net/nice-image.png") (class "image") (data-test-figure-a))
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(img (@ (src "data:image/gif;base64,R0lGODlhAQABAIABAAAAAP///yH5BAEAAAEALAAAAAABAAEAQAICTAEAOw%3D%3D")
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(data-src "https://static.wikia.nocookie.net/nice-image-thumbnail.png")
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(class "thumbimage lazyload"))))
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(noscript
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(a (@ (href "https://static.wikia.nocookie.net/nice-image.png") (class "image"))
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(img (@ (src "https://static.wikia.nocookie.net/nice-image-thumbnail.png")
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(data-src "https://static.wikia.nocookie.net/nice-image-thumbnail.png")
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(class "thumbimage")))))
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(figcaption "Test figure!"))
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(iframe (@ (src "https://example.com/iframe-src")))))))
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(define (updater wikiname #:strict-proxy? [strict-proxy? #f])
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(define classlist-updater
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(compose1
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; uncollapse all navbox items (bottom of page mass navigation)
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(curry u
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(λ (classlist) (and ; removed due to scoping, would improve peformance (eq? element-type 'table)
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(member "navbox" classlist)
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(member "collapsed" classlist)))
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(λ (classlist) (filter (curry (negate equal?) "collapsed") classlist)))
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; uncollapse portable-infobox sections
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(curry u
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(λ (classlist) (and ; removed due to scoping, would improve performance (eq? element-type 'section)
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(member "pi-collapse" classlist)))
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(λ (classlist) (filter (λ (v)
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(and (not (equal? v "pi-collapse-closed"))
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(not (equal? v "pi-collapse"))))
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classlist)))
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; generic: includes article sections and tables, probably more
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(curry u
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(λ (classlist) (and (member "collapsible" classlist)
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(member "collapsed" classlist)))
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(λ (classlist) (filter (curry (negate equal?) "collapsed") classlist)))))
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(define ((string-replace-curried from to) str)
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(string-replace str from to))
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(define class-updater
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(compose1
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(string-replace-curried " collapsed" "")
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(string-replace-curried "pi-collapse-closed" "")
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(string-replace-curried "pi-collapse" "")))
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(define attributes-updater
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(compose1
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; uncollapsing
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#;(curry attribute-maybe-update 'class
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(λ (class) (string-join (classlist-updater (string-split class " ")) " ")))
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(curry attribute-maybe-update 'class class-updater)
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; change links to stay on the same wiki
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(curry attribute-maybe-update 'href
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(λ (href)
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((compose1
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(λ (href) (regexp-replace #rx"^(/wiki/.*)" href (format "/~a\\1" wikiname)))
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(λ (href) (regexp-replace (pregexp (format "^https://(~a)\\.fandom\\.com(/wiki/.*)" px-wikiname)) href "/\\1\\2")))
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href)))
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; add noreferrer to a.image
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(curry u
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(λ (v) (and #;(eq? element-type 'a)
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(has-class? "image" v)))
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(λ (v) (dict-update v 'rel (λ (s)
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(list (string-append (car s) " noreferrer")))
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'(""))))
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; proxy images from inline styles, if strict_proxy is set
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(curry u
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(λ (v) strict-proxy?)
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(λ (v) (attribute-maybe-update
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'style
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(λ (style)
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(regexp-replace #rx"url\\(['\"]?(.*?)['\"]?\\)" style
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(λ (whole url)
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(string-append
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"url("
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(u-proxy-url url)
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")")))) v)))
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; and also their links, if strict_proxy is set
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(curry u
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(λ (v)
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(and strict-proxy?
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#;(eq? element-type 'a)
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(or (has-class? "image-thumbnail" v)
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(has-class? "image" v))))
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(λ (v) (attribute-maybe-update 'href u-proxy-url v)))
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; proxy images from src attributes, if strict_proxy is set
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(curry u
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(λ (v) strict-proxy?)
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(λ (v) (attribute-maybe-update 'src u-proxy-url v)))
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; don't lazyload images
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(curry u
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(λ (v) (dict-has-key? v 'data-src))
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(λ (v) (attribute-maybe-update 'src (λ (_) (car (dict-ref v 'data-src))) v)))
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; don't use srcset - TODO: use srcset?
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(λ (v) (dict-remove v 'srcset))))
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(define (children-updater attributes children)
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; more uncollapsing - sample: bandori/wiki/BanG_Dream!_Wikia
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((λ (children)
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(u
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(λ (v) (has-class? "mw-collapsible-content" attributes))
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(λ (v) (for/list ([element v])
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(u (λ (element) (pair? element))
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(λ (element)
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`(,(car element)
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(@ ,@(attribute-maybe-update 'style (λ (a) (regexp-replace #rx"display: *none" a "display:inline")) (bits->attributes element)))
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,@(filter element-is-content? (cdr element))))
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element)))
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children))
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; wrap blinking animated images in a slot so they can be animated with CSS
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((λ (children)
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(u
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(λ (v) (and (has-class? "animated" attributes)
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((length v) . > . 1)))
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(λ (v)
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`((span (@ (class "animated-slot__outer") (style ,(format "--steps: ~a" (length v))))
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(span (@ (class "animated-slot__inner"))
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,@v))))
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children))
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children)))
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(define (updater element element-type attributes children)
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;; replace whole element?
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(cond
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; wrap tables in a div.table-scroller
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[(and (eq? element-type 'table)
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(has-class? "wikitable" attributes)
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(not (dict-has-key? attributes 'data-scrolling)))
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`(div
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((class "table-scroller"))
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((,element-type (@ (data-scrolling) ,@attributes)
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,@children)))]
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; exclude empty figcaptions
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[(and (eq? element-type 'figcaption)
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(or (eq? (length (filter element-is-element? children)) 0)
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((query-selector (λ (element-type attributes children)
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(eq? element-type 'use))
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element))))
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return-no-element]
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; exclude infobox items that are videos, and gallery items that are videos
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[(and (or (has-class? "pi-item" attributes)
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(has-class? "wikia-gallery-item" attributes))
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((query-selector (λ (element-type attributes children)
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(has-class? "video-thumbnail" attributes))
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element)))
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return-no-element]
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; exclude the invisible brackets after headings
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[(and (eq? element-type 'span)
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(has-class? "mw-editsection" attributes))
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return-no-element]
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; display a link instead of an iframe
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[(eq? element-type 'iframe)
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(define src (car (dict-ref attributes 'src null)))
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`(a
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((class "iframe-alternative") (href ,src))
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(,(format "Embedded media: ~a" src)))]
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; remove noscript versions of images because they are likely lower quality than the script versions
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[(and (eq? element-type 'noscript)
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(match children
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; either the noscript has a.image as a first child...
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[(list (list 'a (list '@ a-att ...) _)) (has-class? "image" a-att)]
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; or the noscript has img as a first child
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[(list (list 'img _)) #t]
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[_ #f]))
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return-no-element]
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[#t
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(list element-type
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;; attributes
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(attributes-updater #; element-type attributes)
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;; children
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(children-updater attributes children))]))
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updater)
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(define (update-tree-wiki tree wikiname #:strict-proxy? [strict-proxy? #f])
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(update-tree (updater wikiname #:strict-proxy? strict-proxy?) tree))
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(module+ test
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(define transformed
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(update-tree-wiki wiki-document "test" #:strict-proxy? #t))
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; check that wikilinks are changed to be local
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(check-equal? (get-attribute 'href (bits->attributes
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((query-selector
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(λ (t a c) (dict-has-key? a 'data-test-wikilink))
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transformed))))
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"/test/wiki/Another_Page")
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; check that a.image has noreferrer
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(check-equal? (get-attribute 'rel (bits->attributes
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((query-selector
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(λ (t a c) (and (eq? t 'a)
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(has-class? "image" a)))
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transformed))))
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" noreferrer")
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; check that article collapse sections become uncollapsed
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(check-equal? (get-attribute 'class (bits->attributes
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((query-selector
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(λ (t a c) (dict-has-key? a 'data-test-collapsesection))
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transformed))))
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"collapsible collapsetoggle-inline")
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; check that iframes are gone
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(check-false ((query-selector (λ (t a c) (eq? t 'iframe)) transformed)))
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(check-equal? (let* ([alternative ((query-selector (λ (t a c) (has-class? "iframe-alternative" a)) transformed))]
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[link ((query-selector (λ (t a c) (eq? t 'a)) alternative))])
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(get-attribute 'href (bits->attributes link)))
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"https://example.com/iframe-src")
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; check that images are proxied
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(check-equal? (get-attribute 'src (bits->attributes
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((query-selector
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(λ (t a c) (eq? t 'img))
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transformed))))
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"/proxy?dest=https%3A%2F%2Fstatic.wikia.nocookie.net%2Fnice-image-thumbnail.png")
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; check that links to images are proxied
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(check-equal? (get-attribute 'href (bits->attributes
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((query-selector
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(λ (t a c) (and (eq? t 'a) (has-class? "image-thumbnail" a)))
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transformed))))
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"/proxy?dest=https%3A%2F%2Fstatic.wikia.nocookie.net%2Fnice-image.png")
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(check-equal? (get-attribute 'href (bits->attributes
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((query-selector
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(λ (t a c) (member '(data-test-figure-a) a))
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transformed))))
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"/proxy?dest=https%3A%2F%2Fstatic.wikia.nocookie.net%2Fnice-image.png")
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; check that noscript images are removed
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(check-equal? ((query-selector (λ (t a c) (eq? t 'noscript)) transformed)) #f)
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; benchmark
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2023-02-12 00:55:33 +00:00
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(when (file-exists? "../storage/Frog.html")
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(with-input-from-file "../storage/Frog.html"
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2022-12-04 10:46:24 +00:00
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(λ ()
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(define tree (html->xexp (current-input-port)))
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(time (length (update-tree-wiki tree "minecraft")))))))
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